EIN Guide for a California Corporation

An Employer Identification Number is a nine-digit federal tax ID issued by the IRS, formatted as XX-XXXXXXX. Think of it as a Social Security number for your business. It identifies the corporation to the IRS and to the wider financial system.

Why a corporation can't skip it

Here's a key difference from an LLC: a single-member LLC can sometimes use its owner's Social Security number for tax purposes. A corporation never can. A corporation is always its own taxpayer — a separate entity that files its own returns — so it always needs its own EIN, from the very first day, regardless of how many people own it or whether it has employees yet.

What you need the EIN for

• Opening a business bank account. No U.S. bank will open a corporate account without an EIN.
• Filing federal tax returns. The corporation files under its EIN.
• Hiring employees and handling payroll tax.
• Applying for business licenses and permits, many of which ask for the EIN.
• Establishing business credit and dealing with vendors and processors that require a tax ID.

Sequence your EIN application correctly and it's painless; get the order wrong and you can create a mismatch that's annoying to fix.

Form the corporation first

Wait until the California Secretary of State has accepted your Articles of Incorporation before you apply for the EIN. The IRS application asks for the corporation's exact legal name and formation details, and you want those to match the state's record precisely. Applying before the corporation officially exists — or with a name the state ends up rejecting — creates a mismatch between your IRS records and your state records that causes friction with banks and filings later.

Then apply right away

Once the corporation is accepted, apply promptly. You'll need the EIN before you can open the corporate bank account, and you'll want the account open before you issue stock and start moving money, so the EIN sits early in your post-formation checklist.

The IRS issues EINs directly and for free. Be wary of any site that charges a fee to "get" your EIN — the number itself always comes from the IRS at no cost.

The online application (fastest)

The quickest route is the IRS online EIN application at IRS.gov. If the responsible party has a U.S. Social Security number or ITIN, the online application issues the EIN immediately at the end of the session. The application is available during posted IRS hours and must be completed in one sitting — it times out if you stop partway, so gather your information first.

What you'll need

• The corporation's exact legal name as filed with California
• The state and date of incorporation
• The name and taxpayer ID (SSN or ITIN) of the responsible party — typically a principal officer
• The type of entity (corporation) and the reason you're applying
• The corporation's mailing address and the number of employees you expect

If you don't have a U.S. taxpayer ID

Foreign founders without an SSN or ITIN can't use the online application. You apply instead by fax or mail using Form SS-4, and by phone in some cases for international applicants. It takes longer than the instant online route, so plan ahead if this is your situation.

The IRS requires every EIN application to name a "responsible party" — the individual who ultimately controls or manages the corporation. This isn't a formality to gloss over.

Who it should be

For a corporation, the responsible party is generally a principal officer — the person who actually exercises control over the entity and its funds. It has to be a natural person, not another entity, and the IRS wants a real individual with a taxpayer ID, not a nominee. In a solo corporation, that's you.

Keeping it current

If the responsible party changes down the road — say, control of the corporation shifts — the IRS expects you to update it using Form 8822-B. Keeping the responsible party accurate matters because that's who the IRS contacts about the corporation's federal tax matters.

A few recurring errors cause the most headaches for new corporations.

The mistakes

• Paying for an EIN. The IRS never charges for it. If a site wants a fee just to obtain the number, you're paying for a free thing.
• Applying before the state accepts your Articles. This risks a name mismatch between the IRS and California. Form first, then apply.
• Using a name that doesn't match the filed Articles. The EIN should be tied to your exact legal corporate name. Small discrepancies cause bank and filing problems.
• Getting more than one EIN for the same corporation. One corporation, one EIN. Applying twice creates duplicate records you'll have to untangle with the IRS.
• Losing the confirmation. Save the IRS confirmation notice (the CP 575) when you get the EIN. Banks and agencies ask for it, and getting a replacement is slower than keeping the original.

Get the EIN right early and it quietly does its job for the life of the corporation. The number never expires and doesn't need renewing — it stays with the corporation until it's dissolved.

The EIN application is genuinely simple once your corporation exists and the responsible party has a U.S. taxpayer ID — many founders handle it themselves in a few minutes on the IRS site. Our core service is getting the corporation formed correctly with California so your legal name and formation details are locked in and match before you apply, which is the part that actually prevents EIN headaches.

We'll point you to the free IRS application and make sure you apply at the right moment in the sequence. If your situation is more complex — a foreign responsible party, or you'd rather not deal with the IRS process — we can talk through the options. What we won't do is charge you for a number the IRS gives out for free.